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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main(){
char c;long long tot=0,cuv=0,nr=0; bool ok=true;
while(!f.eof()){
f>>noskipws>>c;
if(ok){
if((c>='a' && c<='z') || (c>='A' && c<='Z'))
cuv++;
else {
tot+=cuv;cuv=0;nr++; ok=false;
}
}else{
if((c>='a' && c<='z') || (c>='A' && c<='Z')){cuv++;ok=true;}
}
}
g<< tot/nr;
f.close();
g.close();
return 0;
}